112
EXPOSITION AT VIENNA.
to be strong. Some perforated curved bricks like the
figure, 16x4x2 inehes, were also in tho collection.
Curved chanuel tiles
for open drains or
gutters, by the same
exhibitor, merit attention.
These are
made in three parts,
fitted together longitudinally,
and are of
several sizes, all of
tliem with large openiugs
in the body, effecting a great
saving of material and givin«- lighto
o C 1 o
ness and strength.
Dovetailed Beicks.—France.
Mr. E. Pavy, of Chateau du Claveau, near Mezikres-en-Brenne
(Indre), France, exhibited a novel invention, for
which he bas taken out a patent in France, consisting of
bricks fornied with dovetailed recesses in each end, so that
two bricks may be locked fogether by a third piece which fits
into the two opposite openings.
The dimensions of the ordinary bricks are stated as
0 m -25xO m -12X0 m -06, which is about 9|-x4|x2f inehes.
The locking-piece or dovetail is about five inehes loug.
The inventor claims for these bricks that they permit of the
rapid construction of walls of a single course having not only
lightness but great strength ; or of thick walls, of two courses
of the brick, with an air-space between, giving greater
strength than is obtained in ordinary constructions using two
or three times as much material, and consequently requiring
more carting, more time, labor and expense. The circular
brick are designed for round towers and chimneys, and appear
to be favored by the exhibitor as an attraotive mode of
finishing the corners uf constructions, an ideal house being
figured by him with a round tower at each corner.
Window frames of oak, or iron, are made with a dovetailed
recess in the sides, into which the small locking-piece
is fitted, thereby forming a tight joint and holding the
